A couple of us took a look and we cannot see any problem with your email account for your shell (which appears to be the account in question).
I have sent a test email to that account and it was shown as being received instantly in the CNC and a few moments later it was gone.
We noted from the mail logs that you appear to be POPing your email from a computer as well as accessing via QuestMail. Is it possible you have a email client active on your computer or another computer that is actively accessing your email?
Hope this helps,
- Phantom PC syndrome strikes again...